Figures 3.1, 3.2, and 3.3 show how the numbers of tertiary branches vary according to three different patterns of segmental branch length. When the trunk of the secondary branch is short, there are few tertiary branches, but their diameter is sizable (pattern A; Fig. 3.1).
When the trunk of the secondary branch is of medium length, there are several tertiary branches (pattern B; Fig. 3.2).
When the secondary branch is long, there are many (but not more than eight) narrow tertiary branches (pattern C; Fig. 3.3).
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